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首页> 外文会议>SPE Russian Petroleum Technology Conference >Modelling of Injection Well Capacity with Account for Permeability Damage in the Near-Wellbore Zone for Oil Fields in Western Siberia
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Modelling of Injection Well Capacity with Account for Permeability Damage in the Near-Wellbore Zone for Oil Fields in Western Siberia

机译：西西伯利亚近井井区近井网渗透性损伤造型造型

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One of the key fundamental problems in using in jection wells to maintain the reservoir pressure for efficient roduction from oil and gas wells is the colmatation of the near-wellbore zone, which results in the permeability damage, and, hence, the decrease in the injectivity. In these cases one needs to increase the pumping pressure or introduce additional filtering systems on surface, which generally increases the cost of field development. For optimization of the flooding process, it is proposed to use a combined approach based on modeling of suspension filtration with account for colmatation of the near-wellbore zone and applying a cycling regime of injection. A 1D three-continua model is proposed for suspension filtration to describe the permeability damage in the near-wellbore zone of injection wells in the fields of Western Siberia. Governing equations are derived using the multi-continua approach. The carrier phase, as well as the particles, which are being transported and deposited, are described as three distinct continua in terms of field variables. The application of the multi-continua approach allows one to reduce the number of free parameters of the model. The model takes into account the effects of sedimentation (trapping) of particles in the pores (colmatation), mobilization of particles at the velocities higher than a certain threshold value. The model has gone through a thorough validation campaign against significant amount of experimental data with contamination of porous samples by suspensions (core flooding experiments) and mobilization of pre-seeded particles in sand packs. Experimental study of self-colmatation of cores produced from Vendian deposits in one of West Siberian oilfields during the injection of a particle-free fluid. It is found that at a fixed filtration rate, the permeability of rock cores decreases and levels off. An increase in filtration rate results in further decrease of the permeability. In order to reproduce the experimental data on self-colmatation, the three-continua model of filtration was modified to take into account two types of deposited particles: particles attached to pore walls, which are the source of migrating particles, and the particles plugging or bridging the pore throats, which reduce the permeability of the porous medium. The numerical simulations showed that the modified model allows to reproduce the self-colmatation of natural cores, the values of free parameters were found by tuning the model against theobtained experimental data. We carried out the simulations of distributions of reduced permeablity, concentration of suspended particles and the concentration of trapped particles in pores in the nearwellbore zone at continuous and periodic water flooding. It is found that there are periodic regimes of water injection, in which the permeability of the rock is not damaged. The study will be continued after the generalization of suspension filtration model to describe colmatation of a rock both by external and internal fines as well as the calibration of the model against data of experiments carried out using on natural cores.
机译：在jection井中使用石油和天然气井的高效靶来维持储层压力的关键基本问题是近井眼区的植物，这导致渗透性损伤，因此导致注射性的降低。在这些情况下，需要增加泵送压力或在表面上引入额外的过滤系统，这通常会增加现场开发的成本。为了优化洪水过程，建议使用基于悬浮过滤的建模的组合方法，以考虑到近井口区域的植物并施用注射循环制度。提出了一种悬浮过滤的1D三连续模型，以描述西西伯利亚近井井井近井眼区的渗透损伤。使用多连续方法导出控制方程。载体相以及正在运输和沉积的颗粒在场变量方面被描述为三个不同的连续体。多连续方法的应用允许人们减少模型的自由参数数量。该模型考虑了粒子中粒度（植入）在孔中的沉降（捕获）的影响，在高于某个阈值的速度下调动颗粒。该模型通过彻底的验证运动，免受大量实验数据，悬浮液（核心泛滥实验）污染多孔样品并在砂包中调动预接种颗粒。在注射无颗粒流体期间，在西西伯利亚油田中的一户内沉积物自殖的实验研究。发现，在固定过滤速率下，岩石芯的渗透率降低和水平。过滤率的增加导致渗透性进一步降低。为了再现自殖科的实验数据，修改了三连续过滤模型，考虑到两种类型的沉积颗粒：附着在孔壁上的颗粒，其是迁移颗粒的源，堵塞或颗粒堵塞或颗粒桥接孔喉，减少多孔介质的渗透性。数值模拟表明，修改模型允许再现自然核心的自殖度，通过调整模型对特定的实验数据进行测量的自由参数的值。我们在连续和周期性水洪水中对渗透性降低，悬浮颗粒的浓度降低，悬浮颗粒浓度和孔隙孔中被困粒子的浓度进行了模拟。发现有周期性的注水制度，其中岩石的渗透性不会受损。在悬浮过滤模型的推广之后，将继续研究悬浮过滤模型，以描述外部和内部罚款的岩石科学，以及模型与在天然核上进行的实验数据的校准。

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